package com.hhl.test;

import java.util.concurrent.atomic.AtomicReference;

public class SpinLock {
	private AtomicReference<Thread> sign =new AtomicReference<>();
	public void lock() {
		Thread current = Thread.currentThread();
		while (!sign.compareAndSet(null, current)) {
          }
	}
	public void unlock() {
		Thread current = Thread.currentThread();
		sign.compareAndSet(current, null);
	}
}
